Thanks so much!
Yeah, we thought about that and had originally intended to add a single-player "rally mode" where the ball would get returned by some sort of pong paddle, but unfortunately ran out of time to build that mode.
We went through at least 4 different iterations for the fabric physics, and then refined the final version for a while until it felt good enough. It actually ended up being a series of points connected by spring joints with lines drawn between them. Connecting segments end-to-end results in weird pendulum effects, but a series of spring joints on points actually looked pretty good. It required a good amount of tweaking so that the egg wouldn't punch through the ribbons though!